A dirty bird sings to a dirty girl, but the dirty girl hurts the bird.

一只脏鸟对着一个脏女孩唱歌，但是脏女孩却伤害了脏鸟。

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Little Bird said, "But I might dirty your house."

小鸟问：“你不怕我弄脏你的房子吗？”

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It is a dirty [foolish] bird that fouls [soils] its own nest.

再脏[傻，坏]的鸟也不会将自己的窝弄脏。

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Of course, we can't help but be a bit skeptical about trying to control a child's eating habits at school only to return home for a bucket of the Dirty Bird on the couch with moms.

ENGADGET: Primero Food Service: control what your kids eat